Voice operated repeater circuit,申请号US19300459652-传众专利搜索

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发明名称	Voice operated repeater circuit
摘要
申请公布号	US1866592(A)	申请公布日期	1932.07.12
申请号	US19300459652	申请日期	1930.06.07
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	BJORNSON BJORN G.
分类号	H04B3/20	主分类号	H04B3/20
代理机构		代理人
主权项
地址

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